Congenital malformations of larynx (Q31) ICD-10-CM
The Q31 code range covers congenital malformations of larynx with 8 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- congenital laryngeal stridor NOS P28.89
Codes in the Q31 Range 8 codes · 7 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the Q31 range.
Laryngocele
Congenital anomalous dilitation of the laryngeal saccule that may extend internally into the airway or externally through the thyrohyoid membrane.
Laryngomalacia
A congenital or acquired condition of underdeveloped or degeneration of CARTILAGE in the LARYNX. This results in a floppy laryngeal wall making patency difficult to maintain.
Tracheomalacia
A congenital or acquired condition of underdeveloped or degeneration of CARTILAGE in the TRACHEA. This results in a floppy tracheal wall making patency difficult to maintain. It is characterized by wheezing and difficult breathing.
About the Q31 Code Range
ICD-10 code section Q31 covers a range of congenital malformations of the larynx, which are birth defects affecting the voice box. These codes are used to identify specific structural abnormalities present from birth that can impact breathing, voice, and airway function.
The section includes detailed codes such as Q31.0 for a web of larynx (also known as congenital glottic or subglottic web), Q31.1 for congenital subglottic stenosis which involves narrowing below the vocal cords, and Q31.5 for congenital laryngomalacia, a common cause of floppy airway tissue. Other notable codes include Q31.3 for laryngocele (a congenital laryngeal cyst) and Q31.8 for other complex malformations like laryngeal clefts or absent larynx parts. The Q31.9 code is reserved for unspecified congenital larynx malformations where the exact defect is not detailed. Using these ICD-10 codes helps healthcare professionals document and treat specific congenital laryngeal conditions accurately, aiding appropriate clinical management and communication.
Questions About This Page
How many billable codes are in the Q31 range?
Of the 8 codes in this range, 7 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the Q31 range classify?
The range classifies congenital malformations of larynx. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
